It's a custom Paladin armor. This is a recolored version of it made by me. The original armor was made by (I may be wrong) a guy who goes by the name of Samrux.
Terraria Community Forums
DerpoTheMagnificent
ShadowOfDarkness
Theres even a Tree on that shield *_*
DerpoTheMagnificent
Yep, I made that as well. ^-^
ShadowOfDarkness
Pretty Cool 
ShadowOfDarkness
Lol I just got an alert that you liked my comment.....it says its on my profile. *Cough* nope.